Hello all, I am trying a setup with two HackRFs with their antenna ports connected to one another with an RF cable with a 30dB attenuator in between. I would like to send something with one of them and receive with the other.
My steps were as follows: 1. started with lesson1.grc receiver with center_freq of 97M, and channel freq of 96.3M. Added a file sink in parallel with the osmocom source to save the I/Q samples as received by the HackRF. I thus obtained a data file, data.bin, with a part of a song played on the local music channel 96.3. 2. In lesson1.grc, substituted the osmocom source by a file source pointing to data.bin. Played lesson1.grc and was able to hear the audio the same way as in step 1. This confirmed that data.bin contains good I/Q samples. 3. Connected the two HackRFs to each other and played a sample signal on one and received it with the other, saw a strong narrow spike on the receive FFT plot: rachel@radio1:~/Documents/playback$ hackrf_transfer -c 10 -f 96300000 -s 2000000 -a 1 -x 20 4. Transmitted data.bin on one HackFR and tried to receive with lesson1.grc on the other. rachel@radio1:~/Documents/playback$ hackrf_transfer -t data.bin -f 97000000 -s 2000000 -a 1 -x 20 This did not work. On the receiving end, I saw the FFT plot get several narrow spikes and generally rise up, but it did not look like the FFT plot in step #1. A different noise pattern (different from when nothing was transmitted) and some clicking came out of the speaker. What am I missing? Advice appreciated. thanks Rachel
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